Physical Characteristics of mini-EXPLORER
| Parameter | Description |
| Photodetector | Photomultiplier tube |
| Scintillator | Lutetium oxyorthosilicate |
| Crystal pitch | 4 × 4 × 20 mm |
| Total number of crystals | 32,448 |
| Detector ring diameter | 43.5 cm |
| Transaxial FOV | 32.0 cm |
| Axial FOV | 45.7 cm |